Fig. 4From: Probable IgG4-related sclerosing disease presenting as a gastric submucosal tumor with an intense tracer uptake on PET/CT: a case reportThe histopathological findings show lymphoplasmacytic infiltration and fibrosis (×200) (a). Immunohistochemistry findings show the infiltration of IgG4-positive lymphoplasmacytic cells (×400) (b) Back to article page